package com.cn.springcloudwechat.common.utils.baiduai;

import com.cn.springcloudwechat.redis.RedisUtil;
import org.json.JSONArray;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 *  文本内容过滤
 *  百度接口 部分关键词无法过滤
 * @author: Administrator
 * @create: 2018/8/30 9:54
 */

public class AuthServiceUtils {
    /**
     * 获取权限token
     *
     * @return 返回示例：
     * {
     * "access_token": "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567",
     * "expires_in": 2592000
     * }
     */
    private  static String getAuth() {
        // 官网获取的 API Key 更新为你注册的
        String clientId = "6doiyYYTZ1TboGKF8ChQiCeZ";
        // 官网获取的 Secret Key 更新为你注册的
        String clientSecret = "2T8nYjNWamX55QIzwf7Pf6x5LsoZtqYS";
        return getAuth(clientId, clientSecret);
    }

    /**
     * 获取API访问token
     * 该token有一定的有效期，需要自行管理，当失效时需重新获取.
     *
     * @param ak - 百度云官网获取的 API Key
     * @param sk - 百度云官网获取的 Securet Key
     * @return assess_token 示例：
     * "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"
     */
    private static String getAuth(String ak, String sk) {
        // 获取token地址
        String authHost = "https://aip.baidubce.com/oauth/2.0/token?";
        String getAccessTokenUrl = authHost
                // 1. grant_type为固定参数
                + "grant_type=client_credentials"
                // 2. 官网获取的 API Key
                + "&client_id=" + ak
                // 3. 官网获取的 Secret Key
                + "&client_secret=" + sk;
        try {
            URL realUrl = new URL(getAccessTokenUrl);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            // 定义 BufferedReader输入流来读取URL的响应
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String result = "";
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            /**
             * 返回结果示例
             */
            System.err.println("result:" + result);
            JSONObject jsonObject = new JSONObject(result);
            String access_token = jsonObject.getString("access_token");
            Long expireTime = jsonObject.getLong("expires_in");
            //存到redis中
            saveAccessToken(access_token, expireTime);
            return access_token;
        } catch (Exception e) {
            System.err.printf("获取token失败！");
            e.printStackTrace(System.err);
        }
        return null;
    }

    /**
     * 文本内容识别替换
     *
     * @param textContent
     * @return
     */
    public static String textAudit(String textContent) {
        //请求地址
        String authHost = "https://aip.baidubce.com/rest/2.0/antispam/v2/spam?";
        String accessToken = getAccessToken();
        Properties initProp = new Properties(System.getProperties());
        System.out.println("当前系统编码:" + initProp.getProperty("file.encoding"));
        if (accessToken == null) {
            System.err.println("文本内容accessToken获取异常");
            return null;
        }
        String textContextAudit = authHost + "access_token=" + accessToken
                + "&content=" + new StringBuilder(textContent).toString();
        try {
            URL realUrl = new URL(textContextAudit);
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
            connection.setRequestMethod("POST");
            Map<String, List<String>> map = connection.getHeaderFields();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String result = "";
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                result += line;
            }
            if (!"".equals(result)) {
                JSONObject jsonObject = new JSONObject(result);
                System.out.println(jsonObject);
                JSONArray jsonArrayReject = jsonObject.getJSONObject("result").getJSONArray("reject");
                JSONArray jsonArrayReview = jsonObject.getJSONObject("result").getJSONArray("review");
                textContent = filteringIllegalText(jsonArrayReject, textContent);
                textContent = filteringIllegalText(jsonArrayReview, textContent);
            }
            System.err.println("result:" + result);
        } catch (Exception e) {
            System.err.println("文本内容识别失败");
            e.printStackTrace(System.err);
        }
        return textContent;

    }

    /**
     * 获取AccessToken
     *
     * @return
     */
    private static String getAccessToken() {
        Object object = RedisUtil.getInstace().get("accessToken");
        if (object == null) {
            //key 过期
            return getAuth();
        } else {
            return object.toString();
        }
    }

    /**
     * 设置缓存及过期时间
     *
     * @param value
     * @param expireTime
     */
    private static void saveAccessToken(String value, Long expireTime) {
        RedisUtil.getInstace().set("accessToken", value);
        RedisUtil.getInstace().expire("accessToken", expireTime);
    }

    /**
     * 替换特定字符串
     *
     * @param jsonArray
     * @param content
     * @return
     */
    private static String filteringIllegalText(JSONArray jsonArray, String content) {
        System.out.println(content);
        for (int i = 0, b = jsonArray.length(); i < b; i++) {
            JSONArray hit = jsonArray.getJSONObject(i).getJSONArray("hit");
            for (int j = 0, c = hit.length(); j < c; j++) {
                String filteringIllegal = hit.getString(j);
                content = content.replaceAll(filteringIllegal, "****");
            }
        }
        return content;
    }
}
